I'll say the selfish thing. There isn't (and rightly so) any law that requires us to have children. I say use it. Let the suckers who want children raise the children we need to take care of us when we are to old.

My personal recommendation us when in doubt, err on the side of not having children. Don't make life harder on you than it has to be.

Sensible advice if not coloured with the chalk of Ayn Rand!

Hopefully I do a good job and it'll be my honour when my children look after the old when they grow up.

Ideally, they won't look after the old; their robots will.